Essay on Global Warming

991 Words 4 Pages
Global Warming

Climate change is neither new nor unusual. Throughout the history of the earth, the average surface temperature, climate and greenhouse gas concentrations have changed, sometimes gradually other times quite sharply. During the past 10,000 years the earth has been in an interglacial period with a fairly stable climate, surface temperature, and greenhouse gas concentration1. The problem that has arisen in recent times is when scientists analyze the past 150 years, especially the last 50. Scientists have found an increased greenhouse gas concentration, making the 20th century the hottest in the last 10,000 years.

Although the earth has undergone periodic changes known as global cooling and global warming, today’s
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CFC’s and PFC’s are a purely human addition to the atmosphere. Air conditioners, refrigeration, and plastic foam production account for these elevations.

A small change in climate can cause a great deal of change. Many biomes would seriously be affected. A 10C change in climate would cause a 100 mile shift in biomes from the equator. This shift would cause serious economic and humanitarian problems in the United States. Scientists predict by 2100 a climate change of between 10c,at best and a 3.50c, at worst, could happen. Lets assume say a 20c climate change were to occur. A 200 mile shift in the crop band would occur, putting the nations breadbasket largely in Canada, devastating the U.S. economy. The tundra soil of Canada not being as good for agriculture as the plains and rolling hill of the middle eastern United States and the lack of established agribusiness could account for a 10 to 50 decrease in food production. Rain and weather patterns would shift, causing many cities to be relocated. Hurricanes, droughts, flooding and other severe weather would be more prevalent due to increased water vapor in the atmosphere. A severe impact on forestation and biodiversity would occur. Evolutionary adaptation to the new climate takes time and the ½ mile per year movement of forests would not be able to out run it. Aquatic systems would be greatly effected. Coral reefs which are very temperature sensitive would be

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